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Finding the Fourth Proportional to 39,782.99, 54,900.92 and 21,878.12

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Solution

The fourth proportional to 39,782.99, 54,900.92 and 21,878.12 is: 30,192.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,782.99 : 54,900.92 = 21,878.12 : x
  2. Step 2: Convert to fraction form
    39,782.99/54,900.92 = 21,878.12/x
  3. Step 3: Cross multiply
    39,782.99x = 54,900.92 × 21,878.12
  4. Step 4: Simplify right side
    39,782.99x = 1,201,129,107.82
  5. Step 5: Solve for x
    x = 1,201,129,107.82/39,782.99
  6. Step 6: Final answer
    x = 30,192.03

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.